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EFI Automotive, a leading and second-tier automotive supplier, offers innovative and tailor-made solutions to its major international customers in the field of sensors, actuators and intelligent localized systems.

Sensors

Position sensors

Hall-effect technology

A Hall-effect speed or position sensor integrates a silicon chip with a Hall-effect sensing element and a signal processing circuit. Under the effect of a magnetic field created by a magnet inside the sensor or a magnetic target outside the sensor, the chip generates an electrical signal that can be used to measure speed or position:
- Speed sensors deliver electrical pulses at each passage of gear teeth or magnetic targets, induced by the alternating north/south magnetic poles.
- Position sensors generally deliver a signal that varies continuously with the position of a moving metal or magnetic part.

Eddy-current technology for angular sensors

A coil printed on a PCB is excited at a high frequency by an ASIC so that it emits a magnetic field that interacts with a toothed wheel. This interaction produces eddy currents that induce a magnetic field measured by two coils printed on the same PCB. This measurement can be used to determine the angular position of the toothed wheel.

Magnetoresistive Technology

A magnetoresistive speed or position sensor integrates a silicon chip with a resistive element providing a resistance that varies under the effect of a magnetic field and a signal processing circuit. Under the effect of a magnetic field created by a magnet inside the sensor or a magnetic target outside the sensor, the chip generates an electrical signal that can be used to measure speed or position:
- Speed sensors deliver electrical pulses at each passage of gear teeth or magnetic targets, induced by the alternating north/south magnetic poles.
- Position sensors generally deliver a signal that varies continuously with the position of a moving metal or magnetic part.

Modules

Actuators

A DC motor is an electrical machine that converts electrical power into mechanical power.

It is made up of a rotating wound rotor (armature) and a fixed stator (inductor) that creates a magnetic field via a coil or permanent magnets. A collector on the rotor and brushes on the stator transmit the electrical energy to the terminals of the rotor winding.

According to the position of the rotor with respect to the stator, the collector blades impose the change in direction of the voltage supply of each winding at least once per rotation so as to obtain a magnetic field rotating in quadrature with the stator flux.

The motor speed and torque are controlled by the supply voltage, generally regulated by a modulated signal of the PWM type. Part of this voltage is used to oppose the counter-electromotive force of the motor, which is proportional to the speed of rotation.

The rest of the force is used to establish and maintain the current in the windings, which is proportional to the mechanical torque delivered by the motor